Magnetic properties of ultrafine iron particles.
作者： S. Gangopadhyay , G. C. Hadjipanayis , B. Dale , C. M. Sorensen , K. J. Klabunde
关键词: Evaporation 、 Particle size 、 Nuclear magnetic resonance 、 Coercivity 、 Analytical chemistry 、 Ultrafine particle 、 Superparamagnetism 、 Materials science 、 Argon 、 Range (particle radiation) 、 Spectroscopy
摘要: The magnetic and morphological properties of fine Fe particles have been studied. Ultrafine were prepared using a vapor deposition technique under an argon atmosphere. pressure was varied from 0.5 to 8 Torr during evaporation, samples with median diameter in the range 50--200 \AA{} obtained having log-normal distribution. dependence on particle size temperature (10 KT300 K) studied superconducting-quantum-interference-device magnetometry M\"ossbauer spectroscopy. Samples below 90 showed superparamagnetic behavior room temperature. saturation magnetization 25 190 emu/g, higher values corresponding larger particles. For these particles, coercivity 1.05 kOe at structural data suggested core-shell type structure, where core consists metallic shell is composed oxides.
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